Radiator hose fine with vacuum coolant filler but leaks with slight pressure

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Apr 27, 2010
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Maybe just a lesson to learn but had flushed out and cleaned the cooling system of the 2017 Spark after the radiator trans cooler leaked oil into the cooling system. Connected a vacuum filler and it held strong vacuum so I filled it with coolant. Today I start the car to warm it up enough to check the transmission fluid level, but after 5 minutes coolant starts leaking from many spots on the upper radiator hose. I know transmission oil is bad for the rubber hoses but didn't think it would leak right away. Ordered both radiator hoses but wonder if the smaller heater hoses could be damaged too.
 
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